Wireless connected but no internet

After working for years, my laptop all of a sudden can't get internet. It's connected to my wireless DSL modem and says it has excellent signal strength at 11Mbps, but I can't get anything on my browser. I borrowed another laptop from work an it works just fine with my wireless internet. They both run Windows XP. I've tried updating drivers, uninstalling and reinstalling the wireless card, etc. Nothing works. If I connect directly with an ethernet cable to the DSL modem I get full internet. I didn't change anything on my laptop; how does something like this all of a sudden happen???

No, that's not it. The wireless switch is on, and the laptop is actually connected to my wireless internet and says it has excellent signal strength. I just can't get any internet. If I connect with an ethernet cable I get internet just fine. This setup has worked for a couple of years since I got the laptop, but all of a sudden it doesn't work. I didn't change anything. I know it's not the DSL modem/wireless box because my work laptop connects and gets internet with it just fine. I've tried uninstalling and reinstalling everything and newer and older drivers for the wireless card and nothing fixes it.

Same Problem...But I FIXED IT. The the wireless connection stopped working all of a sudden. I was able to get internet while WIRED, but not Wireless, even though I had an excellent wireless connection. I am using a Linksys router and an AT&T Westell modem. They both had DHCP capabilities... The solution, I disabled DHCP on the Linksys router... Now wireless works fine.

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